Figure REF  shows the overall architecture of acoustic environment transfer. In order to extract two features: (1) environment features and (2) content features, the source audio files are translated to spectrograms.
Spectrogram is a 2D visual representation of frequencies of
a given signal with time, while the color represents the magnitude or amplitude (see FigureREF ).
Spectrograms contain rich information of the audio signal,
including the frequency, the time and the amplitude.
Therefore, it is often used as a visualization tool for representing audio signals such as music and speech.
Also, it is widely used
for audio classification[1]}, [2]} and style transfer[3]}, [4]}.
